Anyone else??

Ttc#2- Cycles are very regular. , 30/31 days and according to opk testing I always get peak on day 18.On Saturday (cycle day 24) I experienced a pink discharge on wiping this along with a brownish/red discharge has continued but after 5 days has not got heavier and only there when wiping (not enough to get to a panty liner) Could this be implantation? I would assume wouldn't spot for a week before af when never done before ...based on every other cycle af is due tomorrow on cycle day 30Has anyone else had 6 days of implantation?!